WO2005012700A1 - Dispositif de refoulement d'air secondaire pour un moteur a combustion interne - Google Patents

Dispositif de refoulement d'air secondaire pour un moteur a combustion interne Download PDF

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Publication number
WO2005012700A1
WO2005012700A1 PCT/EP2004/008238 EP2004008238W WO2005012700A1 WO 2005012700 A1 WO2005012700 A1 WO 2005012700A1 EP 2004008238 W EP2004008238 W EP 2004008238W WO 2005012700 A1 WO2005012700 A1 WO 2005012700A1
Authority
WO
WIPO (PCT)
Prior art keywords
secondary air
compressor
turbine
wheel
conveying device
Prior art date
Application number
PCT/EP2004/008238
Other languages
German (de)
English (en)
Inventor
Hans-Georg Lehmann
Martin Schlegl
Holger Stark
Original Assignee
Daimlerchrysler Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Daimlerchrysler Ag filed Critical Daimlerchrysler Ag
Priority to JP2006521485A priority Critical patent/JP2007500813A/ja
Publication of WO2005012700A1 publication Critical patent/WO2005012700A1/fr
Priority to US11/344,967 priority patent/US7260929B2/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/30—Arrangements for supply of additional air
    • F01N3/32—Arrangements for supply of additional air using air pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/04—Units comprising pumps and their driving means the pump being fluid-driven
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/02—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning induction conduits
    • F02D2009/0201—Arrangements; Control features; Details thereof
    • F02D2009/0283—Throttle in the form of an expander
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2220/00—Application
    • F05B2220/40—Application in turbochargers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the invention is based on one
  • a secondary air delivery device for an internal combustion engine is already known (DE 199 37 781 AI), in which both a compressor and a turbine are connected via separate lines 22, 33 to an intake tract 11 downstream of an air filter 12 for the internal combustion engine.
  • the extraction point of the clean air for the compressor and for the turbine is located downstream of the air filter for the intake tract.
  • the lines 22, 33 result in only a slight variability of the installation location for the secondary air supercharger, which is usually constructed as a unit from a compressor and turbine, since depending on the spatial conditions of the internal combustion engine, very long supply lines may result.
  • Such long supply lines involve the risk that uncleaned air can get into the secondary air charger due to leaks.
  • the provision of long supply lines is complex and costly. Advantages of the invention
  • the secondary air delivery device for an internal combustion engine with the characterizing features of claims 1 and 2 has the advantage that a compact component is created which, due to the elimination of supply lines to the intake tract, enables a variety of installation locations or has a high variability of the installation location. In addition, the elimination of the lines to the intake tract results in increased security against the intake of unfiltered air.
  • 1 shows a schematically simplified functional representation of a secondary air conveying device according to a first exemplary embodiment according to the invention
  • 2 shows a schematically simplified functional representation of the secondary air conveying device according to a second exemplary embodiment according to the invention
  • FIG. 3 is a perspective view of a secondary air charger with an integrated control valve
  • FIG. 5 shows a sectional illustration of the secondary air charger according to FIG. 4,
  • FIG. 6 is a perspective view of an air filter element for the secondary air charger
  • FIG. 7 is an exploded view of a compressor wheel of the secondary air charger
  • FIG. 8 shows a perspective view of the compressor wheel according to FIG. 7,
  • FIG. 9 is a partial sectional view of the compressor wheel according to FIG. 8,
  • FIG. 10 is an exploded view of compressor wheels according to a third embodiment of the invention.
  • FIG. 11 is a perspective view of the compressor wheels according to Figure 10,
  • Fig. 12 is a side element of the secondary air charger after a fourth embodiment according to the invention.
  • FIG. 13 shows a perspective top view of the side element according to FIG. 12 with a built-in air filter element
  • FIG. 14 is an exploded perspective view of a turbine wheel according to a further embodiment variant
  • FIG. 15 is a perspective assembly view of the turbine wheel of FIG. 14,
  • FIG. 16 is an exploded perspective view of the turbine wheel according to a further embodiment.
  • Secondary air delivery device for an internal combustion engine 10. Air is supplied to the internal combustion engine 10 via an air filter 4, which air passes further into an intake tract 5, which includes an intake pipe 6 and a throttle valve 7. The air flowing from the air filter, controlled by the throttle valve 7, arrives at cylinders of the internal combustion engine 10, which are not shown in detail.
  • the secondary air conveying device has a secondary air charger 14, which is delimited by dash-dotted lines in FIG. 1 and has a compressor 15 and a turbine 16.
  • the compressor 15 delivers air through a Secondary air line 18 in the exhaust gas region 12 of the internal combustion engine 10.
  • the secondary air line 18 which, for example, flows into the exhaust gas region 12 downstream of the exhaust manifold, is downstream of the compressor 15, for.
  • B. a check valve 20 is provided.
  • the compressor 15 is connected to the turbine 16 via a shaft 21 and is driven by the turbine 16. This uses the pressure difference caused by the throttle valve 7 in the intake tract 5 to the environment by supplying intake air through a supply line 24, for. B. downstream of the throttle valve 7.
  • the supply line 24 leads to the turbine 16.
  • a second control valve 25 is provided in the supply line 24 to control the power output by the turbine 16, which results from the mass flow in the supply line 24 or the prevailing negative pressure in the intake pipe 6. Both control valves 19, 25 can be actuated via corresponding actuators 27, 28.
  • it is now provided to provide a separate air filter element 30 for the turbine 16 and 31 for the compressor 15 in order to provide clean air for the compressor 15 and for the turbine 16, as shown in FIG.
  • Both air filter elements 30, 31 are thus provided in addition to the air filter 4, which makes it possible to dispense with corresponding feed lines to the air filter 4 or the intake pipe 6.
  • the air drawn in by the compressor 15 flows, as the arrows 40 show, via the air filter element 31 and a line section 33 to the compressor 15, where the air is correspondingly compressed or pumped into the secondary air line 18.
  • the amount of secondary air is controlled by the second control valve 25, the check valve 20 provided preventing backflow from the exhaust gas region 12 of the internal combustion engine 10.
  • the turbine 16 enables, in particular in the starting phase of the internal combustion engine 10, the introduction of additional air to the exhaust gas side, as a result of which the hydrocarbons and carbon monoxides are oxidized, which leads to an improvement in the exhaust gas values of the internal combustion engine 10.
  • the first exemplary embodiment provides that both the compressor 15 is assigned an air filter element 31 and the turbine 16 an air filter element 30.
  • the respectively separately assigned air filter elements 30 and 31 make it possible to completely dispense with corresponding supply lines to the clean air side downstream of the air filter 4. This enables the secondary air charger 14 to be highly compact, so that it can be provided at different points in the internal combustion engine 10.
  • FIG. 2 shows a second exemplary embodiment according to the invention, in which all the same or equivalent components are identified by the same reference numerals.
  • a common air filter element 45 is provided, which is assigned to both the compressor 15 and the turbine 16.
  • the provision of a common air filter element 45 for the compressor 15 and the turbine 16 offers further advantages with regard to the configuration of the secondary air charger 14 in terms of its design and the number of its components.
  • the air required by the secondary air charger 14 flows, as the arrows 44 show, through the common air filter element 45 and is divided into a partial flow to the compressor 15 and a partial flow to the turbine 16.
  • the common air filter element 45 can have a different perforation or density distribution of its filter area, which is adapted to the compressor 15 or the turbine 16, since the air mass flows entering the compressor 15 or turbine 16 can differ, in order to achieve an optimal adaptation or filter effect to achieve the lowest possible pressure loss. It is also possible to provide a partition in the interior of the common air filter element 45, so that there are two separate areas which have differently shaped filter areas.
  • Figure 3 shows a perspective view of a secondary air charger 14, in which the second control valve 25, for. B. in the form of a rotary slide valve, is integrated with in a housing 47 of the secondary air charger 14.
  • the housing 47 of the secondary air charger 14 has a frame structure which essentially consists of two side elements, a first side element 48 and a second side element 49, and a plurality of axial struts 50 composed. Both side elements 48, 49 are, as Figure 4 shows in more detail, by the shaft 21 of the secondary air charger
  • the turbine wheel 52 is located outside and the compressor wheel 53 inside an assembly space 60 delimited by both side elements 48, 49.
  • the connection to the feed line 24 to the intake tract 5 is made via a funnel-shaped connecting piece 36.
  • the second control valve 25 is accommodated in the connection piece 36, the actuator 27 being located outside the connection piece 36.
  • the connecting piece 36 without an integrated second control valve 25, as shown in FIG. 5, the second control valve 25 then being separate, ie. H. outside of the secondary air charger 14 is provided.
  • the air compressed by the compressor wheel 53 is discharged into the secondary air line 18 via a connection 37 shown in FIG. 3 on the second side element 49.
  • FIG. 5 shows in more detail, there is a bearing 54 for the turbine wheel 52 in the region of the side wall 48 shown on the left. B. by means of ball bearings, essentially outside the side wall 49 shown on the right. This advantageously results in a relatively large bearing distance for both ball bearings 54 and 55.
  • the compressor wheel 53 like the turbine wheel 52, is screwed onto the shaft 21 via nuts 56, 57. It is also possible to provide or integrate a thread on the compressor wheel 53 or on the turbine wheel 52, so that the wheels 52, 53 can be simply screwed onto the shaft 21 can be done.
  • the compressor wheel 53 is installed rotated by 180 ° with respect to the arrangement which is conventional per se, as is known, for example, in the exhaust gas turbocharger area (for example, from DE 196 15 237 C2), which means that the blading of the compressor wheel 53 inwards, ie shows in the assembly space 60 between the side elements 48, 49.
  • the winding of the compressor wheel 53 is carried out in the opposite direction to the winding of the turbine wheel 52.
  • the compressor wheel 53 is designed as a radial wheel or as a radial compressor. However, it is also possible to use an axial wheel or an axial compressor.
  • the turbine wheel 52 is designed as a radial wheel or as a radial turbine. However, it is also possible to use an axial wheel or an axial turbine.
  • the mounting space 60 recessed between the side elements 48, 49 serves to receive the air filter element 45.
  • the air filter element 45 has a horseshoe-shaped or U-shape, which is composed in one piece from two side parts 61 and an arcuate connecting part 62.
  • a slot 63 is recessed between the side parts 61, which passes approximately in the middle of the air filter element 45 into a recess 64 which is preferably round and has a larger diameter than the shaft 21.
  • End portions 65 of the side parts 61 each have a groove 66, which are provided on the side of the side parts 61 facing the slot 63 and run in the axial direction of the shaft 21.
  • the air filter element 45 When mounting the air filter element 45, it is introduced into the mounting space 60 and guided by the side elements 48, 49 until the locking lugs not shown in the frame element or on the housing 47 correspond to the grooves 66 and engage in the grooves 66.
  • the design of the slot 63 and the recess 64 is designed such that there is a sufficient distance around the rotating shaft 21, which prevents contact or damage to the shaft.
  • the air filter element 45 fills the assembly space 60 in the fully assembled state.
  • FIGs 7 to 9 show the structure of the compressor wheel 53 in more detail.
  • the designs shown below can also be transferred to the turbine wheel 52. Except for the changed shape of the blades, the turbine wheel 52 coincides with the compressor wheel 53.
  • the invention is therefore not limited to the compressor wheel 53, but also includes the turbine wheel 52 in the same way
  • Exemplary embodiment of the turbine wheel 52 is shown in more detail in FIG. 14, an exploded view of the turbine wheel and in FIG. 15, an assembly drawing according to FIG. 14 and in FIG. 16, which shows a second exemplary embodiment of the turbine wheel 52.
  • the compressor wheel 53 (or turbine wheel 52) can have a metallic bushing 70 in the axis area, which is embedded in an impeller 71, which is preferably injection molded from plastic.
  • the impeller 71 is covered by a wheel cover 72, which preferably consists of a thin sheet or is also made of plastic.
  • the wheel cover 72 has a dome-shaped area 73, in which the air can flow in.
  • the wheel cover 72 is axially displaced or set back relative to the impeller 71, so that the protruding part 74 of the wheel cover 72 in combination with an annular groove (not shown in detail) provided in the housing 47 of the secondary air loader 14 has a first seal 100, for. B. in the form of a labyrinth seal.
  • the seal 100 enables the compressor wheel 53 (or the turbine wheel 52) to be sealed in the housing 47 so that all of the air can flow into the interior of the impeller 71 without losses at the dome 73 (in the case of the turbine, there is a corresponding outflow from the interior of the impeller 71).
  • a second seal 101 for. B.
  • a seal for. B. in the form of a labyrinth seal, the radially flowing air from the compressor wheel 53 at its radial end region 105 (in the case of the turbine, the radially inflowing exhaust gas accordingly).
  • the first seal 100 is in the dome area 73 and the second seal 101 is provided in the radial end area 105 of the wheel cover 72 towards the housing and can consist of a labyrinth seal or else of a brush seal.
  • a brush seal there are advantageously only low frictional forces, so that there is a small breakaway torque when the wheel 53 or 52 starts up.
  • the components bushing 73, impeller 71 and wheel cover 72 are joined into one unit. Suitable joining methods are e.g. B. gluing, injection molding or ultrasonic welding.
  • the compressor wheel 53 (or the turbine wheel 52) consists at least partially of plastic, preferably of polyamide and / or peek (polyether ether ketone, a further development of polyether sulfones) and / or PFA (perfluoro alkoxyalkane).
  • the plastic of the compressor wheel 53 (or of the turbine wheel 52) can be designed with or without fiber reinforcement. However, it is also possible to design the compressor wheel 53 (or the turbine wheel 52) from a light metal alloy, in particular based on aluminum or magnesium.
  • This wheel variant has the following advantages, namely that critical tolerances can only occur in the area of the edges of the wheel cover 72. Furthermore, the sealing to the housing 47 takes place essentially in the area of the air inlet or air outlet. The gap between the housing 47 and the wheel cover 72 is not critical, since a sealing effect can be achieved by the annular groove designed as a labyrinth seal in the area of the air inlet and in the area of the air outlet. Furthermore, the effects of typical tolerances, which are inevitable in the case of wheels made of plastics, can be minimized by this construction.
  • FIGS. 10 and 11 it is also possible, as shown in FIGS. 10 and 11, to provide a multi-stage, in particular two-stage, compression. For this purpose, two series-connected compressor wheels 80, 81, which are designed in the form of radial wheels, are shown as examples in accordance with FIGS. Both radial wheels are arranged on the same shaft 21.
  • FIG. 12 shows a fourth exemplary embodiment according to the invention of a side element 49 of the secondary air loader 14, in which all the same or equivalent components have been identified with the same reference numerals from the previous exemplary embodiments.
  • the right side element 48 has three side struts 50, two opposite side struts 50 ⁇ and 50 * serving to insert the air filter element 45.
  • the third side strut 50 X ⁇ ⁇ which extends transversely to the other two side struts 50 ⁇ , 50 ⁇ , is used for the snap-on fastening of the air filter element 45, which for this purpose has two snap-in lugs 90, which can snap into the snap-in grooves 66 also shown in FIG.
  • the compressor wheel 53 is from surrounded by a cylindrical or tubular element 95, which forms an inflow channel for the compressor wheel 53.
  • the conditioned air should flow into the compressor 15 in the axial direction as laminarly as possible through the upstream air filter 45.
  • a ratio of the inflow channel length 1 to the inflow channel cross section q should be 3: 1 or greater, preferably 5: 1. This requirement is not met in the exemplary embodiment according to FIGS. 4 and 5.
  • the inflow channel is formed from parts of the air filter cassette 45 and the struts 50 which form the middle part of the housing. If the width of the middle housing part 50 or the axial extension of the mounting space 60 and thus the length of the inflow channel is increased, then a more favorable ratio results. However, this also leads to an undesirable increase in the overall length of the secondary air charger 14.
  • the tubular element 95 forms the inflow channel for the compressor 15 or compressor wheel 53 and is an integral part of the right-hand side element 49. In the installed state of the side element 49, the tubular element 95 surrounds the shaft 21, preferably up to close to the turbine wheel 52 Shaft 21 protected from damage during assembly of the air filter element 45. At least one opening 96 is provided on the end side of the tubular element 95 facing away from the compressor wheel 53. A plurality of openings 96 are preferably provided, which are cut out in a star shape, radially outward on a lateral surface of the element 95 and are delimited between the provided radial struts 100, so that axially, there are a plurality of circular segments separated from one another by the radial struts 100. The individual segments or lamellae or ribs improve the Ratio of inflow channel length to
  • Inlet duct cross section In addition to the axial inflow into the inflow channel (arrows 97), the openings 96 also enable radial inflow (arrows 98) into the inflow channel.
  • the openings 96 make it possible to reach the area of a laminar air flow.
  • FIG. 13 shows a perspective top view of the side element 49 with the built-in air filter element 45

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Supercharger (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

L'invention concerne un dispositif de refoulement d'air secondaire, comprenant un compresseur d'air secondaire (14) constitué d'un compresseur (15) et d'une turbine (16). Selon ladite invention, cette turbine (16) est entraînée par l'intermédiaire du vide partiel régnant dans une conduite d'admission (5) du moteur à combustion interne et entraîne, de son côté, le compresseur (15) refoulant l'air secondaire dans une zone d'échappement (12) du moteur à combustion interne, l'air nécessaire au compresseur (15) et à la turbine (16) étant acheminé à travers un filtre à air commun (45). Ledit dispositif de refoulement d'air secondaire est destiné à des moteurs à combustion interne, dans lesquels l'air secondaire est acheminé à la zone d'échappement, en particulier en phase de démarrage du moteur à combustion interne.
PCT/EP2004/008238 2003-08-01 2004-07-23 Dispositif de refoulement d'air secondaire pour un moteur a combustion interne WO2005012700A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2006521485A JP2007500813A (ja) 2003-08-01 2004-07-23 内燃機関用の二次空気供給装置
US11/344,967 US7260929B2 (en) 2003-08-01 2006-01-31 Secondary air deliver device for an internal combustion engine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10335260A DE10335260A1 (de) 2003-08-01 2003-08-01 Sekundärluftfördereinrichtung für eine Brennkraftmaschine
DE10335260.0 2003-08-01

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US11/344,967 Continuation-In-Part US7260929B2 (en) 2003-08-01 2006-01-31 Secondary air deliver device for an internal combustion engine

Publications (1)

Publication Number Publication Date
WO2005012700A1 true WO2005012700A1 (fr) 2005-02-10

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ID=34072021

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Application Number Title Priority Date Filing Date
PCT/EP2004/008238 WO2005012700A1 (fr) 2003-08-01 2004-07-23 Dispositif de refoulement d'air secondaire pour un moteur a combustion interne

Country Status (4)

Country Link
US (1) US7260929B2 (fr)
JP (1) JP2007500813A (fr)
DE (1) DE10335260A1 (fr)
WO (1) WO2005012700A1 (fr)

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DE102006004239B4 (de) * 2006-01-30 2008-01-31 Siemens Ag Verfahren zum Betreiben einer Sekundärlufteinrichtung für eine Brennkraftmaschine
DE102006027449A1 (de) * 2006-06-12 2007-12-13 Mann + Hummel Gmbh Brennkraftmaschine mit Sekundärlufteinblassystem
WO2010085494A1 (fr) * 2009-01-20 2010-07-29 Williams International Co., L.L.C. Turbocompresseur avec cartouche de tuyère de turbine
US20110173972A1 (en) * 2010-06-14 2011-07-21 Robert Andrew Wade Internal Combustion Engine Cylinder Head With Integral Exhaust Ducting And Turbocharger Housing
JP5454400B2 (ja) * 2010-07-15 2014-03-26 株式会社富士通ゼネラル プロペラファンおよびその製造方法
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WO2006090702A1 (fr) 2005-02-22 2006-08-31 Hitachi Metals Precision, Ltd. Rotor de compresseur et procédé de fabrication idoine
EP1854570A1 (fr) * 2005-02-22 2007-11-14 Hitachi Metals Precision, Ltd. Rotor de compresseur et procédé de fabrication idoine
JPWO2006090702A1 (ja) * 2005-02-22 2008-07-24 株式会社日立メタルプレシジョン コンプレッサ羽根車およびその製造方法
JP4523032B2 (ja) * 2005-02-22 2010-08-11 株式会社日立メタルプレシジョン コンプレッサ羽根車の製造方法
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DE10335260A1 (de) 2005-02-17
US20060150618A1 (en) 2006-07-13
US7260929B2 (en) 2007-08-28

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